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This unit will produce condensation--quite heavily at times. The outlet drain hose must be allowedto drain. Exhaust Vent piping must also drain condensate. Code 11 error would imply that thesemust be checked.

90% of the time this problem is related to installation issues with either the vent or drain.

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sounds as though it might possibly not be igniting first time , it is ignitiong the gas that is present but not staying lit, You should probably have it looked at / serviced. If you are in the UK it is usual to have a regular service to catch such things. A recommendation from friends for a good boiler technician might be worth taking advantage of .

Try removing the igniter. (First turn the heater off) There is a heat sensor rod on the igniter. If it is blackened use fine sand paper or a scotch brite pad and clean it so it is shiney. reinstall the igniter (turn the heater back on) and try it. If that doesn't work the igniter may be defective and will require replacement. I have a smaller A.O. Smith water heater and that little trick has saved me three service calls. Good luck.

If it says low ignitor current the ignitor usually needs to be replaced. As the ignitor ages its current reduces because it is oxidizing. Eventually it will be detected by the control system that alerts you of the issue. If the control system were not designed to do this, soon it would not be able to ignite the gas. If this happened it could cause a dangerous condition such as a fire or explosion.I hope this helps.